Timescales of magmatic evolution in crustal magma chambers constrained from U-series radioactive disequilibria: A brief review

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1 /, (,**1) , Timescales of magmatic evolution in crustal magma chambers constrained from U-series radioactive disequilibria: A brief review Takeshi KURITANI + (Fig. +) Jaupart and Tait, +33/ Campbell and Turner, +321 ; Jellinek and Kerr, +333 ; Kaneko and Koyaguchi,,*** ; Kerr and Tait, +32/ ; Tait and Jaupart, +323 ; Turner et al., +320 Hess, +31, ; McBirney, +33/ ; Shirley, +321 ; Simura and Ozawa,,**0 21.*3*- Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru, Beppu, Oita 21.*3*-, Japan : 32*2/12 0- Kuritani, +333 ; Kuritani et al.,,**/ Present address: Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Aoba 0-, Aramaki, Aoba-ku, Sendai, Miyagi 32*2/12, Japan. kuritani@mail.tains.tohoku.ac.jp +1

2 72,-* Th/,-, Th,-* Th,-, Th (,-* Th/,-, Th),-* Th,-, Th Fig. +. Schematic illustration of a magma chamber, showing the inferred mechanisms of magmatic processes. Schematic temperature profile is also shown.,,+,-2 U,-/ U,-, Th 0 ln ; l: N : 0,-2 U-,-* Th,-* Th,-, Th,-2 U,-, Th +el,-*th t,-* Th,-, e l,-*th t Th * (+) l,-*th,-* Th * U Th,-, Th,-2 U-,-* Th reference t e l,-*th t * 0,-* Th,-2 U ln,/l,-2 U-,-* Th,-* Th 1 / +.*,-* Th-,,0 Ra +** 2***,,0 Ra-,+* Pb,-, Th-,,2 Ra +** Bourdon et al. (,**-) (,**/),, Rb-Sr Sm-Nd (Alle gre, +302 ; Kigoshi, +301),-2 U-,-* Th (Fig.,) T* U/Th (A B C) (,-* Th/,-, Th) (,-2 U /,-, Th) (A * B * C *) (+) U/Th,-* Th

3 73 (Hawkesworth et al.,,**.),-2 U-,-* Th,-* Th-,,0 Ra,-2 U-,-* Th Fig.,. A U-Th equiline diagram, showing the evolution of a mineral/whole-rock isochron. See text for details. Tt A t, B t, C t +e l,-*th t 0 equiline,-2 U/,-* Th+ equiline,-* Th-,,0 Ra Ra Ra Ba reference Ra Ba Condomines et al.,,**-,-2 U-,-* Th,-* Th-,,0 Ra Ar-Ar +. C (Condomines, +331 ; Jicha et al.,,**/ ; Volpe and Hammond, +33+) (Black et al., +332 ; Cooper et al.,,**+ ;Heathet al., +332 ; Volpe, +33,) Cooper et al.,,**+,,0 Ra 2 Th-Ra (Turner et al.,,**-a) xenocryst (Charlier and Zellmer,,*** ; Turner et al.,,**-a) Condomines et al. (,**-),- U/Th (Fig.,) U/Th A * B * C * Tt A t B t C t U/Th U/Th

4 74 U/ Th U-Th U (Kuritani et al., submitted) Kuno, +30/ ; Philpotts et al., +330 ; +32+ U/Th (Villemant and Fléhoc, +323) Ra/Th (Evans, +333),.,-2 U-,-* Th,-* Th/,-, Th,-* Th/,-, Th (Bourdon et al., +33. ; Widom et al., +33,) (Condomines et al., +322),-2 U-,-* Th (Fig. -) U/Th,-* Th (Turner et al.,,**+) Fig. -. A U-Th equiline diagram, illustrating the principle to obtain a model age. See text for details. (,-* Th/,-, Th) (,-* Th/,-, Th) d (,-* Th/,-, Th) (,-* Th/,-, Th) p U/Th (,-2 U/,-, Th) (+) (,-* Th/,-, Th) (,-* Th/,-, Th) d (,-* Th/,-, Th) * (,-* Th/,-, Th) p Elliott et al., +331 ; Kessel et al.,,**/ ; Yokoyama et al.,,**-

5 75 (Iwamori, +33. ; McKenzie, +32/ ; Spiegelman and Elliott, +33-),/ (Blake and Rogers,,**/ ; Rogers et al.,,**. ; Vigier et al., +333) Fig..,-* Th-,,0 Ra (,,0 Ra/,-* Th), F Ra Ra (,,0 Ra/,-* Th) F.C. Ra : +0**,,0 Ra (,,0 Ra/,-* Th) (+) Ra Ra (,,0 Ra/,-* Th) Sr Nd Pb (,,0 Ra/,-* Th) (Yokoyama et al.,,**0) (Yokoyama et al.,,**0) (,,0 Ra/,-* Th) Fig... A schematic (,,0 Ra/,-* Th) F (the mass of remaining magma relative to the initial mass of magma) diagram, in which possible fractionation curves are shown. Filled circle indicates a parental magma, and filled squares represent observed lava compositions. A model curve for the observed compositions is schematically shown with a broken line. A fractionation curve indicated with F.C. is for the case of instantaneous fractional crystallization.. - Widom et al. (+33,) Azores Sao Miguel : *.0*.1 km - : 1, wt. 3 a 2+* 0 y + Bourdon et al. (+33.) Laacher See phonolite / km - (basanite) : 1* wt. +* a1+* 0 y +

6 76, Turner et al. (,**-b) Sangeang Api *.*+*.+ km - : 1* wt.,*** (,,0 Ra/,-* Th) (a.+*. y + ) Johansen et al. (,**/) La Palma (,,0 Ra/,-* Th) basanite phonolite *.*- km - : 0* wt. +//*+1/* (a.+*. y + ) Kuritani et al. (submitted) - km - +. C, 3 *.+ km -,-2 U-,-* Th, : 0, wt. 3 (a1+* / y + ),* +* - +* / +1,+ COE +11.*-/+ Alle gre, C.J. (+302),-* Th dating of volcanic rocks. a comment. Earth Planet. Sci. Lett., /,,*3,+*. Black, S., Macdonald, R., DeVivo, B., Kilburn, C.R.J. and Rolandi, G. (+332) U-series disequilibria in young (A.D. +3..) Vesuvius rocks : preliminary implications for magma residence times and volatile addition. J. Volcanol. Geotherm. Res., 2,, Blake, S and Rogers, N. (,**/) Magma di#erentiation rates from (,,0 Ra/,-* Th) and the size and power output of magma chambers. Earth Planet. Sci. Lett.,,-0, 0/. 003.

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